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(Synthliboramphus antiquus), a bird of the family Alcidae of the order Charadriiformes. The ancient murrelet is about 25 cm long and weighs about 200 g. The back is gray, the head is black with a white stripe, and the underside is white. The bird is common along the coasts and on the islands of the north Pacific Ocean. In the USSR it is distributed from Kamchatka and the Komandorskie Islands to the northern part of Primor’e Krai and, possibly, Sakhalin. The ancient murrelet migrates south in winter to Japan and California. Nesting occurs on coastal cliffs; two eggs are laid, customarily in crevices or under stones. The diet consists of small marine invertebrates. A related species, S. wumizusume, nests in Japan and is occasionally encountered along the coasts of the USSR.